CN117817054A - A CNC gear hobbing machine with simulated tool setting structure and tool setting method thereof - Google Patents

Abstract

The invention relates to the technical field of tool setting of a numerical control gear hobbing machine, in particular to a numerical control gear hobbing machine with a simulated tool setting structure and a tool setting method thereof, wherein the numerical control gear hobbing machine comprises a machine base, an operation panel and an opening and closing door are arranged on the machine base, a working surface is arranged in the machine base and is positioned on a processing cavity and used for bearing a workpiece clamping platform, a simulated track structure is arranged in the machine base, the simulated track structure comprises an infrared harness generator and an infrared receiving module, and the simulated track structure is positioned on one side in the machine base; the infrared wire harness generator is arranged in the machine base, sliding rails are arranged on the inner wall of the machine base, vertical sliding blocks are symmetrically connected to the sliding rails, a rotating shaft is connected between the symmetrically arranged vertical sliding blocks, the infrared wire harness generator is arranged on the rotating shaft, and a running track is simulated according to the input actual coordinates of the cutter in the machine base and the actual coordinates of the workpiece in the machine base; the infrared receiving module is used for receiving the infrared rays emitted by the infrared beam generator and displaying the infrared beam track.

Description

A CNC gear hobbing machine with simulated tool setting structure and tool setting method thereof

Technical Field

The invention relates to the technical field of tool setting for a numerically controlled gear hobbing machine, and in particular to a numerically controlled gear hobbing machine with a simulated tool setting structure and a tool setting method thereof.

Background technique

CNC gear hobbing machines often use the trial cutting method to set the tool. First, perform the zero return operation and set the tool in the XY direction. The workpiece is mounted on the CNC lathe table through a fixture. When clamping, the four sides of the workpiece should leave space for tool setting; start the spindle to rotate at medium speed, quickly move the table and spindle, and let the tool quickly move to a position close to the left side of the workpiece with a certain safety distance, and then reduce the speed and move it close to the left side of the workpiece; when approaching the workpiece, use fine-tuning operation (generally 0.01mm is used to approach), let the tool slowly approach the left side of the workpiece, so that the tool just touches the left surface of the workpiece (observe, listen to the cutting sound, see the cutting mark, and see the chips. As long as any one of these situations occurs, it means that the tool touches the workpiece), then retreat 0.01mm, and write down the X coordinate value displayed in the machine tool coordinate system at this time.

For example, a bulletin number CN2762945Y discloses a precision automatic tool setting device for a gear hobbing machine, which is composed of a support plate, a cylinder mounted on the support plate, a guide column linked to the cylinder, an asymptotic switch mounted on the cylinder rod, and a fine-tuning device in contact with the end of the guide rod; the automatic tool setting device is provided with a dedicated numerical control system. The cylinder is fixed on the cylinder support, the end of the cylinder rod is connected to the asymptotic switch through a switch frame, and the lower part of the guide column is connected to the side of the switch frame at the end of the cylinder rod through a lateral connecting rod.

When the existing CNC gear hobbing machine is used for processing, the workpiece and the tool are first aligned, and then the program is set according to the coordinates after the alignment. When the tool is aligned, it is necessary to observe the tool alignment situation with the human eye, which will cause tool alignment errors. If the tool is aligned directly according to the input program, it is easy for the tool to collide with the workpiece surface.

Summary of the invention

The object of the present invention is to provide a CNC gear hobbing machine with a simulated tool setting structure and a tool setting method thereof, so as to solve the problems raised in the above-mentioned background technology, add simulated trajectory operation, and during use, the tool setting situation can be grasped in time to avoid the errors caused by tool setting affecting the progress of the process, with high efficiency and safe operation.

The present invention is achieved through the following technical solutions:

A CNC gear hobbing machine with a simulated tool setting structure comprises a machine base, an operation panel and an opening and closing door are arranged on the machine base, a working surface is arranged inside the machine base, the working surface is located on the processing cavity and is used to carry a workpiece clamping platform,

A machine base, in which a simulation track structure is installed, the simulation track structure includes an infrared beam generator and an infrared receiving module, and the simulation track structure is located at one side of the machine base;

An infrared beam generator is located in the machine base, a compensation guide rail is installed on the inner wall of the machine base, a slide rail is installed on the compensation guide rail, a compensation cylinder is installed on the top of the compensation guide rail, the bottom end of the compensation cylinder is connected to the slide rail, vertical sliders are symmetrically connected to the slide rail, a rotating shaft is connected between the symmetrically set vertical sliders, the infrared beam generator is installed on the rotating shaft, and the actual coordinates of the input tool in the machine base and the actual coordinates of the workpiece in the machine base are used to simulate the running trajectory;

The infrared receiving module is used to receive the infrared rays emitted by the infrared beam generator and display the infrared beam trajectory.

Furthermore, the infrared receiving module includes an infrared receiving board, in which an infrared receiver is arranged.

Furthermore, a test surface is provided in the machine base, the test surface is located above the working surface, a simulation frame is installed at the test surface, the simulation frame is located on the workpiece clamping structure and one side of the tool, an infrared receiving module is installed on the simulation frame, a limiting groove and a push-pull groove are provided on the simulation frame, the infrared receiving plate is located in the limiting groove, a fixed end rod, a movable end rod and a hinge shaft are provided in the limiting groove, the fixed end rod and the movable end rod are located at both ends of the limiting groove, the hinge shaft is evenly spaced between the fixed end rod and the movable end rod, a hinge plate 1 is installed between the fixed end rod and the adjacent hinge shaft, and the hinge plate 1 is hinged to the fixed end rod and the hinge shaft respectively;

A hinge plate 2 is installed between the movable end rod and the hinge shaft adjacent thereto, and the hinge plate 2 is hinged to the movable end rod and the hinge shaft respectively.

Furthermore, the distance between the test surface and the working surface is greater than the distance from the working surface to the top of the workpiece after the workpiece is completed.

Furthermore, the fixed end rod and the movable end rod extend through the limiting groove into the push-pull groove, the fixed end rod is fixedly connected to the push-pull groove, and under the action of external force, the movable end rod moves in the push-pull groove, the hingedly connected hinged plate one and hinged plate two form a group of hinged plates, and the infrared receiving plate is composed of multiple groups of hinged plates.

Furthermore, a vertical through slot is provided on the vertical slider, vertical tracks are symmetrically arranged in the vertical through slot, connecting blocks are connected to the vertical tracks, a rotating shaft is located between the connecting blocks, the rotating shaft is rotatably connected to the connecting blocks, one end of the rotating shaft is connected to the motor, and an infrared beam generator is installed on the rotating shaft.

Furthermore, the connecting block is an electric slider, and when the vertical slider moves on the slide rail, the symmetrically set vertical sliders move in the same direction and synchronously, and an extension part is connected between the infrared beam generator and the rotating shaft, one end of the extension part is fixedly connected to the rotating shaft, and the other end is fixedly connected to the infrared beam generator, and the angle between the bottom end surface of the infrared beam generator and the bottom end surface of the extension part is greater than 90°.

Furthermore, the operation panel is provided with a program display screen, an operation terminal, a simulation display terminal and a time display terminal. The operation terminal is provided with a plurality of buttons for inputting the PLC program. The input PLC program is displayed on the program display screen. The infrared receiving module and the simulation display terminal are communicatively coupled. The light beam emitted by the infrared beam generator is irradiated on the infrared receiving module, and its light spot coordinates and running trajectory are displayed on the simulation display terminal. A simulation point is displayed on the simulation display terminal, and the simulation point is the beam light spot.

Based on the above-mentioned CNC gear hobbing machine with a simulated tool setting structure, the present invention also proposes a tool setting method for a CNC gear hobbing machine with a simulated tool setting structure, comprising the following steps:

Step 1: Push the movable end rod to one end of the push-pull groove and away from the fixed end rod through the telescopic cylinder. At this time, the hinged plate 1 and the hinged plate 2 are in a flattened state;

Step 2: The infrared beam generator emits an infrared beam, which shines on the infrared receiving board. At this time, the coordinates of the beam point are the tool coordinates;

Step 3: Two simulation points are displayed on the simulation display end, which are the coordinates of the workpiece on the working surface and the coordinates of the tool projected on the working surface;

Step 4: According to the coordinates on the program display screen, the infrared beam generator moves so that the coordinates of the light spot irradiated by the infrared beam generator are close to another simulation point, and the beam movement trajectory is the actual tool movement trajectory;

Step 5: The analysis module in the operation panel analyzes the movement trajectory of the light beam and sends a signal to the control module;

Step 6: If the trajectory runs correctly, the tool moves, otherwise, the tool does not move.

Furthermore, in step four, the cylinder moves the vertical slider on the slide rail, and the light beam moves in the Y direction; the motor drives the rotating shaft to rotate, and the point where the light beam is projected on the infrared receiving plate moves in the X direction; the light beam stays in the moving position for a period of time, simulating the time required for the tool to actually move down to one side of the workpiece.

Compared with the prior art, the present invention has the following beneficial effects:

1. A simulation trajectory structure is installed in the machine base. Before the tool is set, the actual running trajectory of the tool is simulated through the simulation trajectory structure. If the simulated trajectory is correct, the tool continues to be set, which can avoid the tool colliding with the workpiece during setting, causing damage to the workpiece or the tool, improve safety operation, and extend the service life of the tool.

2. An analog display terminal is provided on the operation panel, which is convenient for visually observing the simulated operation trajectory. The tool can be set according to the simulated tool setting trajectory to avoid tool setting errors and improve the accuracy of tool setting.

3. The infrared receiving board is set to be retractable, unfolded when in use and folded otherwise, which extends the service life of the infrared receiving board while ensuring the accuracy of the simulated running trajectory.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

FIG1 is a front view of a base of the present invention;

FIG2 is an isometric view of the rotating shaft of the present invention;

FIG3 is a front view of the infrared beam generator of the present invention;

FIG4 is an enlarged view of the infrared beam of the present invention;

FIG5 is a front view of the operation panel of the present invention;

FIG6 is a top view of an infrared receiving board of the present invention;

FIG7 is a front view of the push-pull slot of the present invention;

FIG8 is a right side view of an infrared receiving board of the present invention;

FIG. 9 is a module block diagram of the present invention.

Reference numerals: 100, machine base; 101, operation panel; 102, opening and closing door; 103, processing chamber; 104, test surface; 105, working surface;

200, program display screen; 201, operation terminal; 202, simulation display terminal; 203, time display terminal; 204, simulation point; 205, analysis module; 206, control module;

300, vertical slider; 301, slide rail; 302, connection block; 303, rotation axis; 304, infrared receiving module; 305, vertical through slot; 306, vertical track; 307, extension part; 308, infrared beam generator; 309, compensation guide rail; 310, compensation cylinder;

400, push-pull slot; 401, limit slot; 402, movable end rod; 403, hinged plate 2; 404, hinged axis; 405, hinged plate 1; 406, fixed end rod; 407, simulation frame.

Detailed ways

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Embodiment 1:

As shown in FIG1 , a CNC gear hobbing machine with a simulated tool setting structure includes a machine base 100, on which an operation panel 101 and an opening and closing door 102 are provided. A working surface 105 and a test surface 104 are provided in the machine base 100. The working surface 105 is located on a processing cavity 103 and is used to carry a workpiece clamping platform. The test surface 104 is located above the working surface 105, and the test surface 104 is located on one side, so that the simulated tool setting structure does not interfere with the normal processing of the workpiece in the CNC gear hobbing machine.

Meanwhile, the distance between the test surface 104 and the working surface 105 is greater than the distance between the working surface 105 and the top of the workpiece after the workpiece is completed.

As shown in Figures 1 to 3, in order to avoid the collision of the tool or the workpiece during actual tool alignment, which may affect the normal operation of the machine tool, a simulation trajectory structure is provided in the machine base 100. The simulation trajectory structure includes an infrared beam generator 308, an infrared receiving module 304, and a simulation frame 407. The simulation frame 407 is installed on the test surface 104. When installed, the simulation frame 407 is located on one side of the workpiece clamping structure and the tool. The workpiece clamping structure and the tool will not contact the simulation frame 407 when the workpiece clamping structure and the tool are moved in multiple directions for processing.

By adopting the above technical solution, the simulation trajectory structure simulates the tool position movement according to the actual coordinates of the input tool and the workpiece in the machine base, which plays a safety protection role, and then performs tool setting according to the simulated operation trajectory to improve the accuracy of tool setting.

The infrared beam generator 308 is located in the machine base 100, and simulates the running trajectory according to the input actual coordinates of the tool in the machine base and the actual coordinates of the workpiece in the machine base. A compensation guide rail 309 is installed on the inner wall of the machine base 100, and a slide rail 301 is installed on the compensation guide rail 309. A compensation cylinder 310 is installed on the top of the compensation guide rail 309, and the bottom end of the compensation cylinder 310 is connected to the slide rail 301. As the rotating shaft 303 rotates, the X-axis movement of the light beam emitted by the infrared beam generator 308 is realized. At this time, the lowest point of the light beam will move down a certain distance after rotation. In order to compensate for the downward distance, the slide rail 301 is pulled up by the compensation cylinder 301 to ensure that the final beam point residence time corresponds to the time required for the tool to actually move down to one side of the workpiece.

As shown in FIG. 2 , the slide rail 301 is symmetrically connected with vertical sliders 300 , and the two vertical sliders 300 move synchronously and in the same direction to simulate the Y-direction movement of the tool;

A rotating shaft 303 is connected between the symmetrically set vertical sliders 300, an infrared beam generator 308 is installed on the rotating shaft 303, and one end of the rotating shaft 303 is connected to a motor. When the motor drives the rotating shaft 303 to rotate, the light beam of the infrared beam generator 308 installed on the rotating shaft 303 moves in the X direction, that is, the X-direction movement of the tool is simulated;

As shown in FIG5 , a time display terminal 203 is provided on the operation panel 101 , and the time display terminal 203 is used to display the time the light beam stays at a fixed point, that is, the time required for the simulated tool to move down to one side of the workpiece, thereby simulating the downward movement of the tool.

In order to realize the light beam movement simulating the tool movement, an infrared receiving module 304 is further provided in the machine base 100 , which is used to receive the infrared rays emitted by the infrared beam generator 308 and display the infrared beam trajectory.

As shown in Figures 2 and 6, the infrared receiving module 304 includes an infrared receiving board, in which an infrared receiver is provided for receiving the infrared light beam emitted by the infrared beam generator 308. The infrared receiving module 304 is installed on the simulation frame 407, and the size of the infrared receiving board is proportionally reduced to the actual size of the working surface 105.

As shown in Figure 9, at this time, the infrared receiving board is communicatively coupled with the control module 206 of the tool and workpiece clamping structure, and an analysis module 205 is also connected between the infrared receiving module 304 and the control module 206. When the running trajectory on the infrared receiving board is correct, the tool is aligned normally and subsequent operations are completed.

The operation panel 101 is provided with a program display screen 200 and an operation terminal 201 . The operation terminal 201 is provided with a plurality of buttons for inputting a PLC program. The input PLC program is displayed on the program display screen 200 .

According to the input PLC program, the coordinate points in the tool movement trajectory are obtained, and according to the coordinate points obtained in the PLC program, the tool movement trajectory is simulated by moving the infrared light beam.

In the existing tool setting structure of machine tools, the tool is set immediately after the program is input. If the input program is wrong, the tool is likely to hit the workpiece, causing tool damage or workpiece wear. Therefore, before the actual tool setting, the tool motion trajectory is simulated to detect errors in the program and modify them in time, thereby ensuring the accuracy of tool setting.

Based on the above-mentioned CNC gear hobbing machine with a simulated tool setting structure, the present invention also provides a tool setting method for a CNC gear hobbing machine with a simulated tool setting structure, comprising the following steps:

On the infrared receiving board at the initial position, the working coordinates are fixed-point coordinates, and the coordinates of the tool are variable;

The actual position of the workpiece in the machine base 100 is moved to a suitable processing position, and the infrared beam generator 308 performs simulated movement according to the coordinates in the program display screen 200;

The infrared beam generator 308 emits an infrared beam, which shines on the infrared receiving plate. The beam point at this time is the coordinate of the tool that has not moved. The cylinder located at one end of the slide rail 301 moves the vertical slider 300 on the slide rail 301, and the beam moves in the Y direction;

The motor drives the rotating shaft 303 to rotate, and the point where the light beam is projected on the infrared receiving plate moves in the X direction;

The light beam stays for a period of time, and the infrared receiving board sends a signal to the analysis module 205. The analysis module 205 analyzes whether the trajectory operation is correct. If the instruction is correct, the control module 206 sends a signal, and the tool in the machine base moves normally. Otherwise, the tool does not move.

Embodiment 2

On the basis of the above-mentioned first embodiment, in order to further visually see the tool setting trajectory, as shown in FIG5 , an analog display terminal 202 is further provided on the operation panel 101 , and an infrared receiving module 304 is communicatively coupled to the analog display terminal 202 .

The light beam emitted by the infrared beam generator 308 is irradiated on the infrared receiving module 304, and its light spot coordinates and running trajectory are displayed on the simulation display end 202. A simulation point 204 is displayed on the simulation display end 202. The simulation point 204 is the beam light spot. The two simulation points on the simulation display end 202 correspond to the coordinates of the workpiece on the actual working surface and the coordinates of the tool projected on the working surface, respectively.

During operation, the moving track of the light beam is displayed on the simulation display terminal 202, so that the operator can understand the simulation operation status in time and make correct tool setting at a later time.

The other components and principles of this embodiment are the same as those of the first embodiment.

Embodiment 3

On the basis of the above-mentioned embodiment 2, in order to further protect the infrared receiving board, extend its service life, and improve the accuracy of the simulation trajectory, as shown in Figures 6-8, the infrared receiving module 304 is installed on the simulation frame 407, and the infrared receiving board is configured to be foldable. After the simulation action is completed, the infrared receiving board is folded. At this time, the debris generated by the processing will not splash on the infrared receiving board, affecting the next simulation process.

The simulation frame 407 is provided with a limit groove 401 and a push-pull groove 400, the limit groove 401 is used for the retraction and extension of the infrared receiving plate, and the push-pull groove 400 is used for the movement of the movable end rod 402, the infrared receiving plate is located in the limit groove 401, and a fixed end rod 406, a movable end rod 402, and a hinge shaft 404 are provided in the limit groove 401, the fixed end rod 406 and the movable end rod 402 are located at both ends of the limit groove 401, and the hinge shaft 404 is evenly spaced between the fixed end rod 406 and the movable end rod 402, and a hinge plate 405 is installed between the fixed end rod 406 and the adjacent hinge shaft 404, and the hinge plate 405 is hinged to the fixed end rod 406 and the hinge shaft 404 respectively;

A hinge plate 2 403 is installed between the movable end rod 402 and the hinge shaft 404 adjacent thereto. The hinge plate 2 403 is hinged to the movable end rod 402 and the hinge shaft 404 respectively. The infrared receiving plate can be retracted and extended by moving the movable end rod 402 .

The fixed end rod 406 and the movable end rod 402 pass through the limiting groove 401 and extend into the push-pull groove 400. The fixed end rod 406 is fixedly connected to the push-pull groove 400. Under the action of external force, the movable end rod 402 moves in the push-pull groove 400. The hingedly connected hinged plate 1 405 and hinged plate 2 403 form a group of hinged plates, and the infrared receiving plate is composed of multiple groups of hinged plates.

When working, if a simulation track is needed, the fixed end rod 406 is located at one end of the push-pull slot 400, and the movable end rod 402 is located at the other end of the push-pull slot 400. At this time, the infrared receiving plate is in an unfolded state;

When the workpiece is actually processed, the movable end rod 402 is located on one side of the fixed end rod 406, and the distance between the two is the shortest. At this time, the infrared receiving plate is in a retracted state.

The other components and principles of this embodiment are the same as those of the second embodiment.

Embodiment 4

On the basis of the above-mentioned embodiment three, as shown in Figure 3, in order to further ensure the accuracy of the simulated downward movement of the tool, a vertical through groove 305 is provided on the vertical slider 300, and vertical rails 306 are symmetrically set up in the vertical through groove 305. The vertical rails 306 are connected to connecting blocks 302, and the rotating shaft 303 is located between the connecting blocks 302. The rotating shaft 303 is rotatably connected to the connecting blocks 302, and the infrared beam generator 308 is installed on the rotating shaft 303.

The connecting block 302 is an electric slider. When the vertical slider 300 moves on the slide rail 301, it simulates the downward movement of the tool.

As shown in FIG4 , in order to expand the range of movement of the light beam in the X direction, an extension portion 307 is connected between the infrared beam generator 308 and the rotating shaft 303, one end of the extension portion 307 is fixedly connected to the rotating shaft 303, and the other end is fixedly connected to the infrared beam generator 308, and the angle between the bottom end surface of the infrared beam generator 308 and the bottom end surface of the extension portion 307 is greater than 90°.

The other components and principles of this embodiment are the same as those of the third embodiment.

The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims (10)

1. A CNC gear hobbing machine with a simulated tool setting structure, comprising a machine base, an operation panel and an opening and closing door are provided on the machine base, a working surface is provided in the machine base, the working surface is located on the processing cavity and is used to carry a workpiece clamping platform, and is characterized in that a simulated trajectory structure is installed in the machine base, the simulated trajectory structure comprises an infrared beam generator and an infrared receiving module, and the simulated trajectory structure is located on one side of the machine base; the infrared beam generator is located in the machine base, a compensation guide rail is installed on the inner wall of the machine base, a slide rail is installed on the compensation guide rail, a compensation cylinder is installed on the top of the compensation guide rail, the bottom end of the compensation cylinder is connected to the slide rail, vertical sliders are symmetrically connected to the slide rail, a rotating shaft is connected between the symmetrically set vertical sliders, the infrared beam generator is installed on the rotating shaft, and a simulated running trajectory is performed according to the actual coordinates of the input tool in the machine base and the actual coordinates of the workpiece in the machine base; the infrared receiving module is used to receive infrared rays emitted by the infrared beam generator and display the infrared beam trajectory. 2. The CNC gear hobbing machine with a simulated tool setting structure according to claim 1 is characterized in that the infrared receiving module includes an infrared receiving board, and an infrared receiver is provided in the infrared receiving board. 3. The CNC gear hobbing machine with a simulated tool setting structure according to claim 1 is characterized in that a test surface is provided in the machine base, the test surface is located above the working surface, a simulation frame is installed at the test surface, the simulation frame is located on the workpiece clamping structure and one side of the tool, an infrared receiving module is installed on the simulation frame, a limiting groove and a push-pull groove are provided on the simulation frame, an infrared receiving plate is located in the limiting groove, a fixed end rod, a movable end rod and an articulated shaft are provided in the limiting groove, the fixed end rod and the movable end rod are located at both ends of the limiting groove, the articulated shafts are evenly spaced between the fixed end rod and the movable end rod, a hinge plate 1 is installed between the fixed end rod and the adjacent articulated shaft, and the hinge plate 1 is hinged to the fixed end rod and the articulated shaft respectively; A hinge plate 2 is installed between the movable end rod and the hinge shaft adjacent thereto, and the hinge plate 2 is hinged to the movable end rod and the hinge shaft respectively. 4. The CNC gear hobbing machine with a simulated tool setting structure according to claim 3 is characterized in that the distance between the test surface and the working surface is greater than the distance from the working surface to the top of the workpiece after the workpiece is completed. 5. The CNC gear hobbing machine with a simulated tool setting structure according to claim 3 is characterized in that the fixed end rod and the movable end rod extend through the limiting groove to the push-pull groove, the fixed end rod is fixedly connected to the push-pull groove, and under the action of external force, the movable end rod moves in the push-pull groove, the hingedly connected hinged plate one and hinged plate two form a group of hinged plates, and the infrared receiving plate is composed of multiple groups of hinged plates. 6. The CNC gear hobbing machine with a simulated tool setting structure according to claim 1 is characterized in that a vertical through groove is provided on the vertical slider, vertical tracks are symmetrically arranged in the vertical through groove, connecting blocks are connected to the vertical tracks, the rotating shaft is located between the connecting blocks, the rotating shaft is rotatably connected to the connecting blocks, and one end of the rotating shaft is connected to the motor, and an infrared beam generator is installed on the rotating shaft. 7. According to claim 6, the CNC gear hobbing machine with a simulated tool setting structure is characterized in that the connecting block is an electric slider, and when the vertical slider moves on the slide rail, the symmetrically set vertical sliders move in the same direction and synchronously, and an extension part is connected between the infrared beam generator and the rotating shaft, one end of the extension part is fixedly connected to the rotating shaft, and the other end is fixedly connected to the infrared beam generator, and the angle between the bottom end surface of the infrared beam generator and the bottom end surface of the extension part is greater than 90°. 8. The CNC gear hobbing machine with a simulated tool setting structure according to claim 1 is characterized in that the operation panel is provided with a program display screen, an operation terminal, a simulation display terminal and a time display terminal, the operation terminal is provided with a plurality of buttons for inputting a PLC program, and the input PLC program is displayed on the program display screen, the infrared receiving module and the simulation display terminal are communicatively coupled, the light beam emitted by the infrared beam generator is irradiated on the infrared receiving module, and its light spot coordinates and running trajectory are displayed on the simulation display terminal, and a simulation point is displayed on the simulation display terminal, and the simulation point is the beam light spot. 9. A tool setting method using a CNC gear hobbing machine with a simulated tool setting structure as claimed in any one of claims 1 to 8, comprising the following steps: Step 1: Push the movable end rod to one end of the push-pull slot and away from the fixed end rod through the telescopic cylinder. At this time, the hinged plate 1 and the hinged plate 2 are in a flattened state; Step 2: The infrared beam generator emits an infrared beam, which shines on the infrared receiving board. At this time, the coordinates of the beam point are the tool coordinates; Step 3: Two simulation points are displayed on the simulation display end, which are the coordinates of the workpiece on the working surface and the coordinates of the tool projected on the working surface; Step 4: According to the coordinates on the program display screen, the infrared beam generator moves so that the coordinates of the light spot irradiated by the infrared beam generator are close to another simulation point, and the beam movement trajectory is the actual tool movement trajectory; Step 5: The analysis module in the operation panel analyzes the movement trajectory of the light beam and sends a signal to the control module; Step 6: If the trajectory runs correctly, the tool moves, otherwise, the tool does not move. 10. The tool setting method of a CNC gear hobbing machine with a simulated tool setting structure according to claim 9, characterized in that: In step 4, the cylinder moves the vertical slider on the slide rail, and the light beam moves in the Y direction; the motor drives the rotation The axis rotates, and the point where the light beam is projected on the infrared receiving board moves in the X direction; the light beam stays at the moving position for a period of time. Simulates the time required for the tool to actually move down to one side of the workpiece.